S4 stored-XSS + S9 upload-size DoS from the #197 cold API review.
The artwork path trusted client-supplied content types at both ends: upload
validated only the declared multipart Content-Type (never decoded the bytes),
and serving reflected a client `?contentType=` straight into the response
Content-Type on unauthenticated GET sinks (/iptv/logos, /artwork/watermarks).
Chain: upload <script> bytes as image/png -> GET ...?contentType=text/html
serves them as HTML in-origin. nosniff (#279) does not help because the server
explicitly declares text/html.
- Upload: derive the content type from the bytes via SkiaSharp SKCodec
(header-only, no decode -> no decompression-bomb path); reject non-images 422.
New ErsatzTV.Core/Images/ImageContentTypes as the single allow-list source.
Dropped the untrusted declared Content-Type from the UploadArtwork command.
- Serve: removed the ?contentType= reflection structurally -- dropped ContentType
from GetCachedImagePath and the [FromQuery] binding on GetImage/GetWatermark;
the handler always sniffs the file, defaulting application/octet-stream.
ArtworkContentTypeModel.UrlWithContentType is now the bare path; SPA previews
no longer append the query.
- Defense-in-depth: channel-logo / watermark {path, contentType} DTOs run through
ArtworkContentTypeModel.Sanitized(), blanking non-allow-listed types on write.
- S9: Kestrel MaxRequestBodySize from ETV_MAXIMUM_UPLOAD_MB rejects oversized
bodies during read (controller file.Length check kept as friendly-error backstop).
Both serve sinks are IgnoreApi, so no OpenAPI change. Tests: byte-sniff accept/
reject, Sanitized() allow-list, Location no longer carries ?contentType=.
Docs: api-conventions §4a + decisions.md 2026-07-12.
Refs #283#197#66
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Backend plumbing for the SPA transcoding editors (#143 blocker):
- FFmpeg profile response DTO round-trip: add NormalizeAudio, NormalizeVideo,
PadMode, TargetLoudness, NormalizeColors, ResolutionId (keep Resolution name
for compat); DeinterlaceVideo now bool (was bool?). #nullable enable on the DTO.
- New GET /api/ffmpeg/hardware-acceleration-kinds wrapping
GetSupportedHardwareAccelerationKinds (returns enum names as strings).
- Filler preset CRUD: GET-by-id/POST/PUT/DELETE on FillerPresetController with
full request/response DTOs; new FillerPresetFullResponseModel +
GetFillerPresetByIdForApi. CreateFillerPreset now returns the new id
(CreateFillerPresetResult) to match sibling Create commands and enable a
201+Location; updated the one Blazor call site.
- Watermark CRUD: GET-by-id/POST/PUT/DELETE on WatermarkController with full
DTOs (path+contentType, all 15 fields); new WatermarkFullResponseModel +
GetWatermarkByIdForApi.
- Startup: register WatermarkLocation/WatermarkSize as OpenAPI string enums
(they live in ErsatzTV.FFmpeg.State and were documented as ints, mismatching
the Newtonsoft StringEnumConverter runtime serialization).
- Tests: full CRUD controller tests for filler + watermark; contract-test
entries (404/401/422) for the new mutating endpoints; regenerated v1.json.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>